Trestle-joint



I E. B. GILES.

TRESTLE JOINT.

APPLICATION FILED APR. 7. 1920.

1, 3 52, 1 88-. I Patented Sept. 7, 1920.

IN V EN TOR.

7 0 20/3121? 61765 m'm 137mm M f ATTORNEY I I W W at stares.

EDGAR BIRD GILES, OF LOS ANGETdES, CALIFORNIA.

TBESTLE-JOINT.

To alt whom it may concern:

Be it known that I, EDGAR BIRD GILES, a citizen of the United States, residing at Log Angeles, in the county of Los Angeles and State of California, have invented a new and useful Trestle-Joint, of which the following is a specification.

This invention relates to devices for connecting trestle legs to trestle backs in the construction ofscaffolding, staging or temporary platforms.

In building operations a greater or less uponeach job and the trestles for any particular'part of the work are requiredto be of predetermined height; and sometimes at one situation trestles of two or three different heights are required -at successive stages to complete the work at one location. The trestle legs may be of different crosssectional dimensions owing to irregularities in lumber or to different requirements as to strength. With legs of greater length greater cross-sectional dimensions are required and it is desirable to make changes from one length of leg to another with as little delay and expenditure of labor as posmadein pairs, each member of each pair,

having at its top a seat for the trestle back and underneath said seat means for'fixing a trestle leg to the joint. a

In my present invention I make provision for rigidly securing the parts together irrespective of thecross-sect'ional dimensions of the same, so that when the same joint is at tached to a trestle back, it is readily adapted to connect to said trestle back, legs of different cross-sectional dimensions.

Other objects, advantages and features of invention may appear from'the accompanying drawing, the subjoined detail description and the appended claims.

The accompanying drawing illustrates the invention.

Figure 1 is a fragmental view of a trestle with legs of one size connected to the trestle back by a pair of adjustable trestle-irons or Specification of Letters Patent.

Patented Sept. 7,192G. Application. filed April 7, 1920. Serial No. 73,921

joints constructed in accordance with thisinvention.

Fig. 2 is an enlarged perspective view of an adjustable trestle-iron or'joint shown in Fjo' 1 detached from ithe back and applied I to a leg of larger cross-section than shown in Fig. 1.

under and against the sides of a trestle-.

back. number of scaffolding trestles are requlred F igwl is a plan view one complete le 1 socket in exaggerated proportions, clampe in position on a leg. A fragment of the trestle-back and connects tothetrestle-back the joints for a pair of legs, is also shown.

Fig. 5 is a view of the inner. side of a bent leg socket adapted to hold one leglonbolt which normally extends through the;

gitudinally aslant as well as laterally aslant,

a fragment of a leg is shown 'clamped in place.

Fig. 6 is a view analagous to Fig.5,show ing the outer face of the companion leg.

The joint is constructed oftwo sets of complementary, relatively adjustable, socket .sections 1, 2 each of which sections is pro .vided with a trestleeback receiving seat 3 formed bythe shoulders land the facesil, 1 5 adapted .to .fit against the lateral, faces 6 of thetrestle-back 7; andsaidsections are each provided with a semi-socketv 8 of aggregatedepth less than the' width ,of the leg 9, to the edges of which the two secsockets cooperating to form a legsfocket. The connection between the twosections of each socket is composed of two tongues 10, 10 one projecting. from each section of the tion 2 of the joint is provided with a groove 13 so that the adjacentsurface may be flush with the face and tongue of section 1. The tongues may each have a slot, and in juxtations may .be applied tightly, .thesemis.

socket piece toward the other,- and provided V with a horizontal slot as at 11 or 12. Secposition form means by which the sections may be secured together by a bolt 14 passed through both tongues of both pairs of socket pieces applicableto form a joint securing two legs at one place to and on opposite sides .of. the trestle-back.

The seat 3 for the trestle-back 7 is'composed of two shoulders 4 arranged at the inner edges of the sections; and each of the sections is provided upon its inner face below said shoulders 4 with a lug and a hole 16- to receive a clampin bolt 17 which is provided with a nut 18 and is adapted to force the two sections toward each other to' clamp the leg. p

In practice the trestle back 7 is bored at the appropriate places to receive the bolts 14. Each leg is fitted in the socket formed of the sections 1, 2; and said sections are clamped on the leg by means of the bolt 17 and nut 18. Then the legs are applied as indicated in Fig. 'lto opposite vertical faces of the-back 7,'and a bolt 14 is passed through the slots 11, 12 on one side of the back 7, thence through the back and'then through the slots 11 and 12 on the other side of the back. Then thenut 19 of the bolt leis applied and tightened, thus rigidly fixing the legs in place. I

In order to'knock down the trestle, it is only necessary to loosen the nuts and withdraw the legs, leaving the sockets on the back,'or to withdraw bolts 14, leaving'the to another, it is only necessary to loosen the sockets clamped on the legs.

In. order to change fromone slze of leg nut 19, drive back the bolt 14 slightly, loosen nuts'1-8, withdraw the legs 9 and adjust the members 1, 2 to the requisite wvidth for chunping the desired legs, then insert the legs into the sockets therefor, and re-tighten thenuts18, and finally the nuts 19. j

The operation of application, change, and removal with respect to the bent legs shown in Figs. 5 and 6 issubstantiallythe same as that just described.

The seats 3 for the trestle-back may be made in any desired angular relation to the clamping socket so as to allow the-legs to eX- tend aslant longitudinally as well as laterat any desired angle to-the trestle-back. 'claim.

1". A trestle joint comprising two rela- 1 tivelyadj ustablc' socket sections means for fixing said socket sections to-the'side of the trestle back, and adjustable means for 2. A trestle joint comprising two complementary-members provided with tongues and sockets, and with lugs extending. from the socketed portions; means to force the bolt by clamping said socket sections upon artrestle I V abolt for securing the .tongues to a trestleback.

mentary sections provided with tongues and sockets, a bolt Ior securing the tongues toa trestle-back, there being pro ections from the socketed porti'onsof said sections provided with bolt holes, and a bolt extending through said bolt holes and adapted to clamp the sections upon a trestle leg.

4:; T he combination with a trestle-back of two sets of complementary adjustable socket lugs toward each other to clamp a leg; and l 3.. A trestle joint comprising two complemembers, each set being slidably connected by slot and bolt connections to form sockets of: variable sizes; and means for clamping said sets of socket members to the trestleback-on opposite sides thereof.-

In a trestle joint comprising two sockets, each of which sockets is composed of two complementary members provided with lugs adapted to receivea bolt and also provided with tongues slotted to receive a means of which said complementary members are adapted to be bolted together on the trestle-back in position to fit't'restle iegsof different sizes; there being shoulders on said socket pieces adapted to support the trestle back and to hold: said socket pieces at i an angle to such trestle-backga bolt adapted to draw the lugs toward each other, and a bolt i extending through the tongues and trestle-back to hold said trestle-back and legs "in rigid relation to'one another.

6. A trestle joint-socket comprising two adjustable complementary sections having "a perpendicular face adapted to be applied to the side of a trestle-back, and having a socket adapted to be clamped upon a legto support the trestle-back, said joint having its socketed'leg-receivin'g end arranged in such angular relation. to the perpendicular face, as to form a brace by extendlng the leg outward both laterally and longitudinally rela-fi 'tive to thetrestle-back.

- In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 1st day of April, 1920.

v EDGAR Brno" GILES. WVitness: .x'

JA ES R. TOWNSEND. 

